George, There is a different MAC address for WiFi vs Ethernet.
Thanks Tony. I understand that. Each hardware interface requires a unique MAC.
What I was pointing out is that when I look at the Network Details on the Hopper, it lists the MAC address for LAN Port #1 as 04:c9:d9:6a:a0:1f to which I have now assigned a fixed IP address of 192.168.0.90
When I look at the Routes in my Router, it shows the 192.168.0.90 address assigned to MAC 04:c9:d9:6a:a0:1e
Note the last 2 digits.